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State Route 128 over Conn Creek

Napa County, California · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

State Route 128 over Conn Creek in Napa County, California, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2020, making it 5 years old at the 2025 inventory.
It carries about 3,300 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 71 of the 160 inventoried bridges in Napa County rated good (44.4%); 8 (5.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous prestressed concrete slab
Length	about 134 ft
Location	04-nap-128-r7.41
NBI structure number	21 0115
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.

Bridge	Built	Vehicles/day	Condition
State Route 29 over State Route 221 (soscol)	2024	79,300	Good
State Route 29 over American Canyon Creek	1943	48,000	Fair
State Route 29 over Nvrr Napa River Stanly	1977	48,000	Poor
State Route 29 over Stanley Creek	1981	48,000	Fair
State Route 29 over Dry Creek	1970	43,000	Fair
St Rte 29 Byway E over Craig Creek	1958	43,000	Good